diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index cc4b7cad54..93d303e55f 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -10687,6 +10687,8 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
     /* Now the real processing loop */
     for (i = 1; progargv[i]; i++) {
         const char *arg = progargv[i];
+        bool argRecognized = true;
+
         /* Make sure we have a single - for all options to
            simplify next logic */
         if (STRPREFIX(arg, "--"))
@@ -11363,7 +11365,29 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
                    STREQ(arg, "-nodefaults") ||
                    STREQ(arg, "-nodefconfig")) {
             /* ignore, always added by libvirt */
+        } else if (STREQ(arg, "-device") && progargv[1 + 1]) {
+            const char *opts = progargv[i + 1];
+
+            /* NB: we can't do WANT_VALUE until we're sure that we
+             * recognize the device, otherwise the !argRecognized
+             * logic below will be messed up
+             */
+
+            if (STRPREFIX(opts, "virtio-balloon")) {
+                WANT_VALUE();
+                if (VIR_ALLOC(def->memballoon) < 0)
+                    goto error;
+                def->memballoon->model = VIR_DOMAIN_MEMBALLOON_MODEL_VIRTIO;
+            } else {
+                /* add in new -device's here */
+
+                argRecognized = false;
+            }
         } else {
+            argRecognized = false;
+        }
+
+        if (!argRecognized) {
             char *tmp = NULL;
             /* something we can't yet parse.  Add it to the qemu namespace
              * cmdline/environment advanced options and hope for the best
@@ -11501,7 +11525,7 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
         virDomainMemballoonDefPtr memballoon;
         if (VIR_ALLOC(memballoon) < 0)
             goto error;
-        memballoon->model = VIR_DOMAIN_MEMBALLOON_MODEL_VIRTIO;
+        memballoon->model = VIR_DOMAIN_MEMBALLOON_MODEL_NONE;
 
         def->memballoon = memballoon;
     }
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-boot-cdrom.xml b/tests/qemuxml2argvdata/qemuxml2argv-boot-cdrom.xml
index b5c37bb466..b63982199c 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-boot-cdrom.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-boot-cdrom.xml
@@ -24,6 +24,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-boot-floppy.xml b/tests/qemuxml2argvdata/qemuxml2argv-boot-floppy.xml
index e42f7edd55..610321fff3 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-boot-floppy.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-boot-floppy.xml
@@ -30,6 +30,6 @@
     <controller type='fdc' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-boot-network.xml b/tests/qemuxml2argvdata/qemuxml2argv-boot-network.xml
index 8124f347dd..f4ebc2ea8c 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-boot-network.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-boot-network.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-clock-localtime.xml b/tests/qemuxml2argvdata/qemuxml2argv-clock-localtime.xml
index 2acb71ffcc..4e1f66b242 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-clock-localtime.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-clock-localtime.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-clock-utc.args b/tests/qemuxml2argvdata/qemuxml2argv-clock-utc.args
index 57fc6e3d2a..9ed48c1339 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-clock-utc.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-clock-utc.args
@@ -1,5 +1,6 @@
 LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
 /usr/bin/qemu -S -M \
-pc -m 214 -smp 1 -nographic -monitor unix:/tmp/test-monitor,server,nowait \
--no-acpi -boot c -usb -hda /dev/HostVG/QEMUGuest1 -net none -serial none -parallel \
-none
+pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi -boot c -usb -hda /dev/HostVG/QEMUGuest1 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-console-compat.xml b/tests/qemuxml2argvdata/qemuxml2argv-console-compat.xml
index b1ee29ce85..dc2f851bc7 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-console-compat.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-console-compat.xml
@@ -29,6 +29,6 @@
     <console type='pty'>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom-empty.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom-empty.xml
index d8ff67654d..60b3168987 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom-empty.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom-empty.xml
@@ -29,6 +29,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom.xml
index 75b9cec6c2..5d94ec0b44 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-cdrom.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-cdrom.xml
index 59ef29ddb6..31d3702877 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-cdrom.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-cdrom.xml
@@ -29,6 +29,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-disk.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-disk.xml
index 0c9bc08590..3b06a973ef 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-disk.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-boot-disk.xml
@@ -29,6 +29,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-directsync.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-directsync.xml
index 0b85fb1a2a..779aa17388 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-directsync.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-directsync.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-unsafe.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-unsafe.xml
index 4bd8e24e0a..481cc55252 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-unsafe.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-unsafe.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml
index 7fe9082626..933feb4bb7 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml
index f0e7df4e1a..4cc449d9a4 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml
index 0beda48c33..63fb2b0a6d 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml
index 00730f7fd9..dcac86123b 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml
index 6ee75aa965..0a93f0028d 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-enospace.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-enospace.xml
index 92fcd8a9b5..ab88224f38 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-enospace.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-enospace.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-stop.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-stop.xml
index 83d5dd0be8..b78be46162 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-stop.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-stop.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-wreport-rignore.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-wreport-rignore.xml
index ded9cd1ff0..14dd1ca8e0 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-wreport-rignore.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-error-policy-wreport-rignore.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-fmt-qcow.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-fmt-qcow.xml
index 85fe2a9520..a36b09c89b 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-fmt-qcow.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-fmt-qcow.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-gluster.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-gluster.xml
index 7c1fdb16ca..dce5f2397e 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-gluster.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-gluster.xml
@@ -30,6 +30,6 @@
     </disk>
     <controller type='usb' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.xml
index a6b13abb5f..1764259f80 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.xml
@@ -30,6 +30,6 @@
     </disk>
     <controller type='usb' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-export.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-export.xml
index dd52c39d68..62b17ecb3b 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-export.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-export.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6-export.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6-export.xml
index c3bfa34c83..0ba7a05e67 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6-export.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6-export.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6.xml
index 8087f90894..aaafa6390d 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-ipv6.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-unix.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-unix.xml
index 0955fee688..82aeaf1ed0 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-unix.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd-unix.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd.xml
index e74b95f222..6d18d72afa 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-nbd.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ceph-env.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ceph-env.xml
index bba512e850..37e9db52e8 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ceph-env.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ceph-env.xml
@@ -32,6 +32,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ipv6.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ipv6.xml
index 06e852de97..bc9d8d0452 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ipv6.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-ipv6.xml
@@ -33,6 +33,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd.xml
index bba512e850..37e9db52e8 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd.xml
@@ -32,6 +32,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-sheepdog.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-sheepdog.xml
index d20ca3e6f3..fc9ad163c6 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-sheepdog.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-sheepdog.xml
@@ -30,6 +30,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-floppy.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-floppy.xml
index 8bbd32402e..343767d1c6 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-floppy.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-floppy.xml
@@ -36,6 +36,6 @@
     <controller type='fdc' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-many.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-many.xml
index edcd01519b..96742374cc 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-many.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-many.xml
@@ -41,6 +41,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-usb.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-usb.xml
index 730c4f3dc4..74a30df6ae 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-usb.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-usb.xml
@@ -28,6 +28,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio.xml
index 3e2e550aea..458c55d8f3 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio.xml
@@ -40,6 +40,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-xenvbd.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-xenvbd.xml
index 3baf97d535..e0bad718b9 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-xenvbd.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-xenvbd.xml
@@ -40,6 +40,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl-fullscreen.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl-fullscreen.xml
index 4aa385c186..01776546fc 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl-fullscreen.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl-fullscreen.xml
@@ -29,6 +29,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl.xml
index 66ea35d811..6bebd10cf2 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl.xml
@@ -29,6 +29,6 @@
     <video>
       <model type='vga' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-policy.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-policy.xml
index 01989300d2..694343f62b 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-policy.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-policy.xml
@@ -31,6 +31,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-sasl.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-sasl.xml
index eda2e87c5f..b35c2bddd2 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-sasl.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-sasl.xml
@@ -31,6 +31,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-socket.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-socket.xml
index 2b138652ea..44df226164 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-socket.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-socket.xml
@@ -29,6 +29,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-tls.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-tls.xml
index eda2e87c5f..b35c2bddd2 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-tls.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-tls.xml
@@ -31,6 +31,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-websocket.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-websocket.xml
index 11e5a7a1fe..cfa61be704 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-websocket.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-websocket.xml
@@ -24,6 +24,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc.xml b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc.xml
index 267876f9e3..356ac36005 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc.xml
@@ -31,6 +31,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-pci-address.xml b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-pci-address.xml
index 422127cc36..b9b5c140ec 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-pci-address.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-pci-address.xml
@@ -28,6 +28,6 @@
         <address domain='0x0000' bus='0x06' slot='0x12' function='0x5'/>
       </source>
     </hostdev>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-address.xml b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-address.xml
index ee00634e10..5807eff926 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-address.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-address.xml
@@ -28,6 +28,6 @@
         <address bus='14' device='6'/>
       </source>
     </hostdev>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hyperv.xml b/tests/qemuxml2argvdata/qemuxml2argv-hyperv.xml
index bb36fc0af5..5b800409e7 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hyperv.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hyperv.xml
@@ -24,6 +24,6 @@
     <emulator>/usr/bin/qemu</emulator>
     <controller type='usb' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-input-usbmouse.xml b/tests/qemuxml2argvdata/qemuxml2argv-input-usbmouse.xml
index 0863737a82..5765a04a96 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-input-usbmouse.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-input-usbmouse.xml
@@ -24,6 +24,6 @@
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
     <input type='mouse' bus='usb'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-input-usbtablet.xml b/tests/qemuxml2argvdata/qemuxml2argv-input-usbtablet.xml
index 03558dd044..59d04ebec8 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-input-usbtablet.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-input-usbtablet.xml
@@ -24,6 +24,6 @@
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
     <input type='tablet' bus='usb'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-kvmclock.xml b/tests/qemuxml2argvdata/qemuxml2argv-kvmclock.xml
index a187aaac4c..32fb3492e3 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-kvmclock.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-kvmclock.xml
@@ -21,6 +21,6 @@
     <emulator>/usr/bin/kvm</emulator>
     <controller type='usb' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-machine-core-off.xml b/tests/qemuxml2argvdata/qemuxml2argv-machine-core-off.xml
index 5eb229f76f..37a9e22f1c 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-machine-core-off.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-machine-core-off.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-machine-core-on.xml b/tests/qemuxml2argvdata/qemuxml2argv-machine-core-on.xml
index 0dd5b39e3e..b98f43481e 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-machine-core-on.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-machine-core-on.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-migrate.xml b/tests/qemuxml2argvdata/qemuxml2argv-migrate.xml
index 3a375fe85d..5fcc470c48 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-migrate.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-migrate.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-misc-acpi.xml b/tests/qemuxml2argvdata/qemuxml2argv-misc-acpi.xml
index 6fe8a8599f..5e1a101ee5 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-misc-acpi.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-misc-acpi.xml
@@ -26,6 +26,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-s3.xml b/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-s3.xml
index b9313e05ab..80d8f0f01f 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-s3.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-s3.xml
@@ -26,6 +26,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-suspends.xml b/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-suspends.xml
index f432732afd..5da5fa60a6 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-suspends.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-misc-disable-suspends.xml
@@ -27,6 +27,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-misc-enable-s4.xml b/tests/qemuxml2argvdata/qemuxml2argv-misc-enable-s4.xml
index cea52f8c9c..8263642216 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-misc-enable-s4.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-misc-enable-s4.xml
@@ -26,6 +26,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-misc-no-reboot.xml b/tests/qemuxml2argvdata/qemuxml2argv-misc-no-reboot.xml
index 10c2d419e2..43a88eed69 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-misc-no-reboot.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-misc-no-reboot.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-misc-uuid.xml b/tests/qemuxml2argvdata/qemuxml2argv-misc-uuid.xml
index 6fe8a8599f..5e1a101ee5 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-misc-uuid.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-misc-uuid.xml
@@ -26,6 +26,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-eth-ifname.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-eth-ifname.xml
index 8ad6eb74ca..d616918340 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-eth-ifname.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-eth-ifname.xml
@@ -29,6 +29,6 @@
       <target dev='nic02'/>
       <model type='rtl8139'/>
     </interface>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-eth.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-eth.xml
index 6f00fe1252..bc1a981084 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-eth.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-eth.xml
@@ -28,6 +28,6 @@
       <script path='/etc/qemu-ifup'/>
       <model type='rtl8139'/>
     </interface>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-user.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-user.xml
index 960b7aab59..80330aa0fb 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-user.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-user.xml
@@ -27,6 +27,6 @@
       <mac address='00:11:22:33:44:55'/>
       <model type='rtl8139'/>
     </interface>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio.xml
index 195a3d9620..5c0ef5522e 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-virtio.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-virtio.xml
@@ -27,6 +27,6 @@
       <mac address='00:11:22:33:44:55'/>
       <model type='virtio'/>
     </interface>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-nographics-vga.xml b/tests/qemuxml2argvdata/qemuxml2argv-nographics-vga.xml
index 3a375fe85d..5fcc470c48 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-nographics-vga.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-nographics-vga.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-nosharepages.xml b/tests/qemuxml2argvdata/qemuxml2argv-nosharepages.xml
index 5e54cd0aa9..c53b7c3410 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-nosharepages.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-nosharepages.xml
@@ -26,6 +26,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-parallel-tcp.xml b/tests/qemuxml2argvdata/qemuxml2argv-parallel-tcp.xml
index 60ea84688f..a3dfe9abd4 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-parallel-tcp.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-parallel-tcp.xml
@@ -28,6 +28,6 @@
       <protocol type='raw'/>
       <target port='0'/>
     </parallel>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pseries-disk.xml b/tests/qemuxml2argvdata/qemuxml2argv-pseries-disk.xml
index 64b70f3125..1f896f8e2f 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-pseries-disk.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pseries-disk.xml
@@ -36,6 +36,6 @@
     <video>
       <model type='cirrus' vram='9216' heads='1'/>
     </video>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pseries-nvram.xml b/tests/qemuxml2argvdata/qemuxml2argv-pseries-nvram.xml
index d001ee78ba..9703bd4c35 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-pseries-nvram.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pseries-nvram.xml
@@ -16,7 +16,7 @@
     <emulator>/usr/bin/qemu-system-ppc64</emulator>
     <controller type='usb' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
     <nvram>
       <address type='spapr-vio' reg='0x4000'/>
     </nvram>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-qemu-ns-no-env.xml b/tests/qemuxml2argvdata/qemuxml2argv-qemu-ns-no-env.xml
index 29f84db2c9..3e4313297e 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-qemu-ns-no-env.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-qemu-ns-no-env.xml
@@ -23,7 +23,7 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
   <qemu:commandline>
     <qemu:arg value='-unknown'/>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-disabled.xml b/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-disabled.xml
index 883a8045c3..974b966ed2 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-disabled.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-disabled.xml
@@ -17,6 +17,6 @@
     <emulator>/usr/bin/qemu</emulator>
     <controller type='usb' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-enabled.xml b/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-enabled.xml
index a298b9d7ee..4d400e1e28 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-enabled.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-reboot-timeout-enabled.xml
@@ -17,6 +17,6 @@
     <emulator>/usr/bin/qemu</emulator>
     <controller type='usb' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-restore-v1.xml b/tests/qemuxml2argvdata/qemuxml2argv-restore-v1.xml
index 138a83ad48..b40ca80b84 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-restore-v1.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-restore-v1.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-restore-v2.xml b/tests/qemuxml2argvdata/qemuxml2argv-restore-v2.xml
index 3a375fe85d..5fcc470c48 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-restore-v2.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-restore-v2.xml
@@ -23,6 +23,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-dev.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-dev.xml
index b1a74291b6..4c4de66be8 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-dev.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-dev.xml
@@ -31,6 +31,6 @@
       <source path='/dev/ttyS2'/>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-file.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-file.xml
index 4335f43f35..e4b039651b 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-file.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-file.xml
@@ -31,6 +31,6 @@
       <source path='/tmp/serial.log'/>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-many.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-many.xml
index 4829285594..8bce8f5f9d 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-many.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-many.xml
@@ -33,6 +33,6 @@
     <console type='pty'>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-pty.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-pty.xml
index d2af760ccb..1de2305150 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-pty.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-pty.xml
@@ -29,6 +29,6 @@
     <console type='pty'>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-telnet.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-telnet.xml
index 06ce154ed5..5a667d7994 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-telnet.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-telnet.xml
@@ -33,6 +33,6 @@
       <protocol type='telnet'/>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp.xml
index 493f8a1073..cc8bcfeafb 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp.xml
@@ -33,6 +33,6 @@
       <protocol type='raw'/>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml
index d5259652da..8cc2f9c570 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml
@@ -37,6 +37,6 @@
       <source mode='connect' host='127.0.0.1' service='9998'/>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-unix.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-unix.xml
index 8aa052d956..6bb1ce9602 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-unix.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-unix.xml
@@ -31,6 +31,6 @@
       <source mode='connect' path='/tmp/serial.sock'/>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-vc.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-vc.xml
index 12107d723c..ea789abc82 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-serial-vc.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-vc.xml
@@ -29,6 +29,6 @@
     <console type='vc'>
       <target type='serial' port='0'/>
     </console>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-smp.xml b/tests/qemuxml2argvdata/qemuxml2argv-smp.xml
index 55bf16d398..365e9dfe1b 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-smp.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-smp.xml
@@ -26,6 +26,6 @@
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-sound.xml b/tests/qemuxml2argvdata/qemuxml2argv-sound.xml
index 0bd1185e74..734900316e 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-sound.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-sound.xml
@@ -27,6 +27,6 @@
     <sound model='es1370'/>
     <sound model='sb16'/>
     <sound model='ac97'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-watchdog.xml b/tests/qemuxml2argvdata/qemuxml2argv-watchdog.xml
index 32d57e06bf..2bbb826b81 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-watchdog.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-watchdog.xml
@@ -24,6 +24,6 @@
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>
     <watchdog model='ib700' action='poweroff'/>
-    <memballoon model='virtio'/>
+    <memballoon model='none'/>
   </devices>
 </domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index d8782d8d84..4288d7cab6 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -632,7 +632,7 @@ mymain(void)
     DO_TEST_FAILURE("reboot-timeout-enabled", NONE);
 
     DO_TEST("bios", QEMU_CAPS_DEVICE, QEMU_CAPS_SGA);
-    DO_TEST("clock-utc", NONE);
+    DO_TEST("clock-utc", QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_DEVICE);
     DO_TEST("clock-localtime", NONE);
     DO_TEST("clock-localtime-basis-localtime", QEMU_CAPS_RTC);
     DO_TEST("clock-variable", QEMU_CAPS_RTC);